Exercise Protects against Cancer-induced Cardiac Cachexia.

Area of Science:

• Cardiovascular Science
• Oncology
• Cellular Biology

Background:

• Cancer negatively impacts cardiac function by stimulating autophagy.
• While exercise is cardioprotective, its role in modulating autophagy-related tumor growth and cardiac health remains unclear.

Purpose of the Study:

• To investigate the effects of voluntary wheel running exercise on tumor morphology and cardiac function in a rat model.

Main Methods:

• Fisher 344 rats were divided into four groups: sedentary non-tumor bearing, sedentary tumor bearing, wheel run non-tumor bearing, and wheel run tumor bearing.
• Tumor inoculation was performed at week 4, and cardiac function was assessed at week 6 after a 6-week intervention period.

Main Results:

• Sedentary tumor-bearing rats exhibited significantly reduced left ventricular developed pressure and increased cardiac autophagy (LC3-II) compared to controls.
• Tumor mass was significantly larger in sedentary tumor-bearing rats, with increased tumor autophagy (LC3-II), compared to exercised tumor-bearing rats.
• Exercise preserved cardiac function and attenuated autophagic markers in both cardiac and tumor tissues.

Conclusions:

• Voluntary exercise mitigates cardiac dysfunction and excessive autophagy in tumor-bearing rats.
• Exercise may preserve cardiac function through reduced tumor growth and improved regulation of autophagy.
• Aerobic exercise demonstrates potential as a therapeutic strategy for managing cardiac complications in cancer patients.